SMBJ18E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ18E3/TR13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Microchip Technology. This surface-mount component operates in the 18V reverse standoff voltage class and provides surge protection for general-purpose applications. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified when electrical and mechanical parameters align with the primary specifications, enabling direct replacement or design flexibility based on availability, packaging format, and source preferences.

Substiute Parts

SMBJ18E3/TR13

Microchip TechnologyIn Stock: 815SMBJ18E3/TR13 Datasheet

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SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

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SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

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SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

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SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

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SMBJ18A-13-F

Diodes IncorporatedIn Stock: 29399SMBJ18A-13-F Datasheet

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SMBJ18A-TR

STMicroelectronicsIn Stock: 6238SMBJ18A-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution validity for SMBJ18-class TVS diodes is determined by the following key parameters:

• Voltage - Reverse Standoff: Must be 18V (required match for circuit protection specification)
• Voltage - Breakdown (Min): Must be 20V (required match for protection threshold)
• Voltage - Clamping (Max) @ Ipp: Acceptable range 29.2V to 32.2V (lower clamping voltage improves transient suppression efficiency)
• Current - Peak Pulse (10/1000µs): Minimum 18.6A (equal or greater pulse current capability required)
• Power - Peak Pulse: 600W (fixed specification across all alternatives)
• Operating Temperature Range: Minimum coverage of -55°C ~ 150°C (acceptable if equal to or broader than primary part)
• Package / Case: DO-214AA or DO-214AC with SMB or SMA designation (determines PCB footprint compatibility)
• RoHS / Compliance: ROHS3 Compliant (regulatory requirement)

All identified substitutes meet these criteria and are sourced from active product lines.

Parameter Comparison

Engineering Selection Recommendations

SMBJ18A-13-F (Diodes Incorporated) and SMBJ18A-TR (STMicroelectronics) provide direct substitution with matched package designations (DO-214AA, SMB) to the primary SMBJ18E3/TR13. Both parts maintain ROHS3 compliance and MSL-1 status. Operating temperature range for these alternatives covers -55°C ~ 150°C, which meets the primary specification minimum of -55°C and extends to the same 150°C maximum. Peak pulse current capability exceeds the primary part (20.5A and 21.5A respectively versus 18.6A), providing equivalent or superior transient suppression performance.

SMBJ18A (EVVO Semi) is available in volume quantities (35,100 pcs) and maintains electrical equivalence across voltage specifications and power ratings. This part utilizes DO-214AC, SMA package designation, which differs from the SMB footprint of the primary part. Selection of the EVVO Semi variant requires PCB layout compatibility verification with the SMA package pinout and land pattern.

All substitutes are sourced from active product lines with ROHS3 certification and unlimited MSL rating, indicating full compliance with supply chain and environmental requirements equivalent to the primary part.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18A (EVVO Semi) replace SMBJ18E3/TR13 in existing designs? A: SMBJ18A from EVVO Semi is electrically equivalent in standoff voltage (18V), breakdown voltage (20V), and power rating (600W). However, the package type differs: SMBJ18A uses DO-214AC (SMA) while SMBJ18E3/TR13 uses DO-214AA (SMB). PCB layout and land pattern compatibility must be verified before substitution.

Q: What is the difference between SMB and SMA packages for TVS diodes? A: SMB (DO-214AA) and SMA (DO-214AC) are distinct surface-mount packages with different footprint dimensions and land patterns. Direct physical interchange is not possible without PCB redesign. Component datasheet footprint diagrams specify exact dimensions for each package type.

Q: Why do substitute parts show lower clamping voltage values? A: Substitute parts with lower maximum clamping voltage (29.2V versus 32.2V) provide superior transient suppression performance. Lower clamping voltage indicates faster voltage suppression during surge events. All listed alternatives remain within acceptable operating limits for 18V protection specifications.

Q: Are all substitute parts certified to the same environmental and compliance standards? A: All listed substitutes carry ROHS3 compliance certification and MSL-1 (Unlimited moisture sensitivity) status. All components are designated Active product status from the respective manufacturers, ensuring ongoing supply continuity and support.

Q: What is the minimum acceptable peak pulse current for this product category? A: The primary SMBJ18E3/TR13 specifies 18.6A peak pulse current (10/1000µs). All identified substitutes meet or exceed this specification (20.5A to 21.5A), ensuring equivalent or improved surge handling capacity.

Q: Can I mix different manufacturers' SMBJ18-class TVS diodes on the same board? A: Yes. All substitute parts identified maintain electrical equivalence in critical parameters: 18V reverse standoff, 20V breakdown minimum, and 600W peak pulse power. Package type compatibility with PCB layout must be confirmed individually for each part number.